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Substrate for display device and manufacturing method thereof

a technology of display device and substrate, which is applied in the direction of liquid surface applicators, instruments, coatings, etc., can solve the problems of limiting the pattern shape of the colored layer which can be formed by the electrode position method, the process is difficult to be simplified, and the electrode position method is difficult to achieve the effect of improving the display quality of the display devi

Inactive Publication Date: 2006-06-22
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention has made in view of the above-mentioned state of the art. The present invention has an object to provide: a substrate for display device, in which generation of an area not filled with liquid material and mixing (color mixing) between liquid materials are suppressed when a functional film is formed by a method using liquid material, such as the IJ method, and display quality in display device can be improved; a manufacturing method thereof; and a color filter substrate, a thin film transistor array substrate, a liquid crystal display device and an organic electroluminescent display device each comprising the substrate for display device.
[0013] The present inventors have made various investigations about a substrate for display device which can improve display quality in display device by suppressing phenomenon such as the void if a functional film is formed by a method using liquid material such as the ink jet method. And they have noted an ejection pattern when the liquid material for functional film is ejected inside a bank. And they have found that if the liquid material for function film is ejected at least at a corner inside the bank, the generation of an area not filled with liquid material can be suppressed, because the corner of the bank is filled with the liquid material while suppressing the mixing (color mixing) between the liquid materials. That is, they have found that if the liquid material for functional film is ejected at least at the corner inside the bank, uniformity of the film thickness in the functional film can be improved, and the functional film is represented by a contour pattern extending to the corner inside the bank, which gives a substrate for display device in which phenomenon such as the void are suppressed. As a result, they have admirably resolved the above-mentioned problems, and completed the present invention.

Problems solved by technology

Therefore, the process is difficult to be simplified.
And a spin coat in the application step causes greater loss of the material.
However, the electrode position method limits a pattern shape of the colored layer which can be formed.
The printing method also has a difficulty in formation of a high-definition pattern.
However, this method might cause an ink mixing between dots, because the ink is ejected on the bank partitioning dots.
And in the method, a sufficient film thickness as the colored layer might not be obtained because the ink might remains on the bank, and therefore the ink amount inside the bank decreases.
Therefore, when such a CF substrate is used for a liquid crystal display device, a leakage might occur between a pixel electrode formed on the CF substrate and a pixel electrode formed on the opposed substrate.

Method used

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  • Substrate for display device and manufacturing method thereof
  • Substrate for display device and manufacturing method thereof
  • Substrate for display device and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0063] This Embodiment explains a formation of the colored layer (functional film) of the color filter substrate used for a liquid crystal display device. FIG. 1A is a plane view schematically showing a position at which a droplet of liquid material (ink) for functional film is ejected in Embodiment 1. FIG. 1B is a plane view schematically showing, with a contour pattern, a film thickness of a colored layer formed in Embodiment 1. A dotted line in FIG. 1B expresses a contour line of a colored layer 13a.

(1) Formation of Bank

[0064] The bank 11 was formed on a substrate 10 before formation of the colored layer 13. The Black matrix (BM) 11 was formed as the bank firstly by applying a photosensitive acrylic resin containing a black pigment on the glass substrate 10 and secondly by exposing and developing the applied resin. The BM 11 was formed in a lattice pattern so that a substantially square-shaped aperture (an area forming the colored layer: 150 μm in length and 450 μm in breadth)...

embodiment 2

[0070]FIG. 3A is a plane view schematically showing a position at which a droplet of liquid material (ink) for functional film is ejected in Embodiment 2. FIG. 3B is a plane view schematically showing, with a contour pattern, a film thickness of a colored layer formed in Embodiment 2. A dotted line in FIG. 3B expresses a contour line of a colored layer 13b.

[0071] In the present embodiment, the colored layer 13b having 1.6 μm in average thickness, 2.0 μm in thickness at the center, and 1.1 μm in thickness at the corner was formed in the same manner as in Embodiment 1, except that the ink 12 was ejected at a corner inside the BM 11, and also at the center in the longitudinal direction of the BM 11 drop by drop at regular spaces, as shown in FIG. 3A. The present Embodiment allows the ink 12 to spread to the corner as shown in FIG. 3B, and therefore the same effects as in Embodiment 1 could be obtained.

embodiment 3

[0072]FIG. 4A is a plane view schematically showing a position at which a droplet of liquid material (ink) for functional film is ejected in Embodiment 3. FIG. 4B is a plane view schematically showing, with a contour pattern, a film thickness of a colored layer formed in Embodiment 3. A dotted line in FIG. 3B expresses a contour line of a colored layer 13c.

[0073] In the present embodiment, the colored layer 13c having 1.6 μm in average thickness, 2.0 μm in thickness at the center, and 1.1 μm in thickness at the corner was formed in the same manner as in Embodiment 1, except that the ink 12 was ejected at a corner inside the BM 11, and ejected in order that the number of the ejection was gradually decreased from the end of the narrow side inside the BM 11 to the center as shown in FIG. 4A. The present Embodiment allows the ink 12 to spread to the corner as shown in FIG. 4B, and therefore the same effects as in Embodiment 1 could be obtained. And in the present Embodiment, the ejecti...

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Abstract

To provide: a substrate for display device, in which generation of an area not filled with liquid material and mixing (color mixing) between liquid materials are suppressed when a functional film is formed by a method using liquid material, such as the IJ method, and display quality in display device is improved; a manufacturing method thereof; and a color filter substrate, a thin film transistor array substrate, a liquid crystal display device and an organic electroluminescent display device each comprising the substrate for display device. A substrate for display device having a structure with a functional film partitioned by a bank on the substrate, the functional film being represented by a contour pattern extending to a corner inside a bank.

Description

REFERENCE TO RELATED APPLICATION [0001] This Nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No. 2004-371747 filed in Japan on Dec. 22, 2004 and the entire contents of which are hereby incorporated by reference. BACKGROUD OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a substrate for display device, a manufacturing method thereof, a color filter substrate, a thin film transistor array substrate, a liquid crystal display device and an organic electroluminescent display device. More specifically, the present invention relates to a substrate for display device used for a liquid crystal TV and the like, and a method for manufacturing thereof, and a color filter substrate, a thin film transistor array substrate, a liquid crystal display device and an organic electroluminescent display device each comprising the substrate for display device. [0004] 2. Description of the Related Art [0005] Recently, there ...

Claims

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Application Information

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IPC IPC(8): G02F1/136
CPCG02F1/1333G02F1/133512
Inventor NIIYA, HIROTAKAOKUMOTO, YOSHITAKAKISHIMOTO, SATORU
Owner SHARP KK